From: "Iruatã Souza" <iru.muzgo@gmail.com>
To: 9front@9front.org
Subject: [9front] [patch] add log2 to ape
Date: Sun, 6 Dec 2020 17:56:59 +0100 [thread overview]
Message-ID: <3e3488b7-ef5f-3fc2-bff9-611a96bf86e6@gmail.com> (raw)
Hi,
This adds log2 to APE. It is defined in posix and at least Lua expects it.
diff -r 543ad076adbc sys/src/ape/lib/ap/math/log.c
--- a/sys/src/ape/lib/ap/math/log.c Sun Dec 06 15:08:23 2020 +0100
+++ b/sys/src/ape/lib/ap/math/log.c Sun Dec 06 17:45:18 2020 +0100
@@ -10,7 +10,7 @@
#include <math.h>
#include <errno.h>
-#define log2 0.693147180559945309e0
+#define _log2 0.693147180559945309e0
#define ln10o1 .4342944819032518276511
#define sqrto2 0.707106781186547524e0
#define p0 -.240139179559210510e2
@@ -46,7 +46,7 @@
temp = ((p3*zsq + p2)*zsq + p1)*zsq + p0;
temp = temp/(((zsq + q2)*zsq + q1)*zsq + q0);
- temp = temp*z + exp*log2;
+ temp = temp*z + exp*_log2;
return temp;
}
@@ -60,3 +60,9 @@
}
return log(arg) * ln10o1;
}
+
+double
+log2(double arg)
+{
+ return log(x)/_log2;
+}
next reply other threads:[~2020-12-06 16:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-06 16:56 Iruatã Souza [this message]
2020-12-06 18:49 ` ori
2020-12-07 10:16 ` Iruatã Souza
2020-12-07 11:34 ` Iruatã Souza
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